创建 MYSQL 触发器时遇到错误

Question

DELIMITER $$
DROP TRIGGER IF EXISTS TRIGGER_BEFORE_USERS_MAUALEXPIRY_USEREXPIRAY_UPDATE $$


CREATE TRIGGER TRIGGER_BEFORE_USERS_MAUALEXPIRY_USEREXPIRAY_UPDATE 


    BEFORE UPDATE ON USERS
    FOR EACH ROW 
    BEGIN
    IF @DISABLE_TRIGGERS IS NULL THEN
        IF  NOT (NEW.MANUALEXPIRATIONDATE <=> OLD.MANUALEXPIRATIONDATE) THEN

            SET NEW.CUSTOMFIELD2 = NEW.MANUALEXPIRATIONDATE;
        IF  NOT(NEW.USEREXPIRYDATE <=> OLD.USEREXPIRYDATE)  THEN

            SET NEW.CUSTOMFIELD3 = NEW.USEREXPIRYDATE;
        END IF;
        END IF;         

    END$$

DELIMITER ;

错误代码：1064。您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以获取正确的语法，以便在第 17 行的 '' 附近使用

Answer 1

CREATE TRIGGER TRIGGER_BEFORE_USERS_MAUALEXPIRY_USEREXPIRAY_UPDATE     

    BEFORE UPDATE ON USERS
    FOR EACH ROW 
    BEGIN
    IF @DISABLE_TRIGGERS IS NULL THEN
        IF  NOT (NEW.MANUALEXPIRATIONDATE <=> OLD.MANUALEXPIRATIONDATE) THEN    
            SET NEW.CUSTOMFIELD2 = NEW.MANUALEXPIRATIONDATE;
        END IF;
        IF  NOT(NEW.USEREXPIRYDATE <=> OLD.USEREXPIRYDATE)  THEN    
            SET NEW.CUSTOMFIELD3 = NEW.USEREXPIRYDATE;
        END IF;    
    END IF;
END
$$